Hint:About 1,200 people lived in and around this place, most of them women, children, and priests. The buildings are thought to have been planned and built under the supervision of professional architects. Most of the structures are built of granite blocks cut with bronze or stone tools, and smoothed with sand. The blocks fit together perfectly without mortar, although none of the blocks are the same size and have many faces; some have as many as 30 corners. The joints are so tight that even the thinnest of knife blades can't be forced between the stones.